Ionic Compounds Ch.6 & 7

Ionic Bonding – strongest of all bonds definiton – results from the electrical attraction between cations (+) and anions (-) “ions” means charges in our case Calculated by the difference between electronegativity values (over 1.7) Figure 2 -- p.176

Ionic Bonding Positive ions are formed from the metal elements when they lose electrons Negative ions are formed from the nonmetal elements when they gain electrons The two, (+) and (-) come together to form a new compound

Ionic Compounds definition – composed of positive and negative ions that are combined so that the numbers of positive and negative charges are equal In a neutral compound, the net charge will be zero Balance the charges from cations and anions until the compound is neutral

Forming Ionic Compounds Na+ + Cl-  NaCl Ca2+ + Cl-  CaCl2 Mg2+ + O2-  MgO Fe3+ + S2-  ______ beryllium + iodine  ______

Naming Ionic Compounds Name the metal first (complete name) Name the root of the nonmetal the change the ending to –ide If there is a polyatomic (more than one atom carrying one charge) use the name as it is Transition metals have a Roman numeral after it to tell its charge

Naming Ionic Compounds NaCl ____________________ CaCl2 ____________________ MgO ____________________ Fe2S3 ____________________ BeI2 ____________________